Thermometer



(No Model.)

' A .B AYER.

THERMOMETER.

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NITED STATES PATENT OFFICE.

ADOLPH BAYER, OF BROOKLYN, NEW YORK.

THERMOMETER.

SPECIFICATION forming part of Letters Patent No. 383,691, dated May 29, 1888.

Application filed December29, 1887. Serial No. 259,317. (No model.)

To all whom it may concern.-

Be itknown that I, ADOLPH BAYER, a citizen of the United States, residing at Brooklyn, in the county of Kings and Stateof New York, have invented new and useful Improvements in Thermometers, of which the following is a specification.

My invention relates to improvements in clinical thermometers; and itconsists in a clinical thermometer having a transparent-glass tube and abulb of glass colored in its body, all of which is more fully pointed out in the followingspeeification and claims, and illustrated in the accompanying drawings, in which Figure 1 represents a face view of a thermometer embodying my invention. Fig. 2 is a vertical section thereof. Fig. 3 is a face view of a modification.

Similar letters indicate corresponding parts.

In the drawings, the letter A designates a thermometer-tube, which is made of the usual transparent glass.

Bis the bulb, which is made from a glass rendered more or less opaque by the use of coloring-matter in the body thereof. In the manufacture of such thermometers the tube A is drawn in the usual manner, and the bulb of colored glass is then attached at a to the tube, according to the usual method of uniting glass objects.

The glass used for the bulb may be of any color, varying in shades from opaque white to black, or two or more colors may be combined in one bulb.

In Fig. 3 I have shown transverse portions 1) of colored glass alternating with transverse portions 0 of transparent glass, said portions extending about the girth of the bulb-however, they could extend lengthwise. Instead of the transparent portionsc colored portions could be substituted, the'latter portions differing in color from those marked 6.

The advantage of a colored bulb is that the thermometer isrendered thereby more sensitive to changes in heat, which is especially valuable in clinical thermometers, as these are are obviated by employinga thermometer hav ing a bulb colored in its body.

It is evident that the bulb must not necessarily be colored throughout the entire thickness of the glass of which it is made, asacoating of colored glass or enamel over the transparent glass would answer the same purpose. The colored bulb can be applied to thermometer-tubes of any construction, and therefore I do not wish to restrict myself tothe ones shown.

It is well known that thermometers are made containing a colored liquid which gives to the bulbs the appearance of being colored,although the bulbs are made of transparent glass. This of course I do not claim.

What I claim as new, and desire to soon re by Letters Patent, is-

l. A thermometer having a transparent glass tube and a bulb of glass colored in its body, substantially as shown and described.

2. A thermometer having a transparent glass tube and a bulb of glass having transparent portions 1) and portions 0, colored in their body, substantially as shown and described.

In testimony whereof I have hereunto set my hand and seal in the presence of twosnbscribing witnesses.

ADOLPII BAYER. [L s] Witnesses:

W. HAUFF, E. F. KASTENHUBER. 

